Renesas X5328P

Overview

X5328P from Renesas Electronics is a CPU supervisor IC integrating power-on reset control, supply voltage supervision, and 32Kbit SPI EEPROM in a single 8-lead SOIC package. It asserts an active-low RESET signal during power-up (≥200ms) and low-VCC conditions (trip points: 2.55–4.75V), while supporting 2MHz SPI communication and block-lock EEPROM protection for embedded microcontroller systems.

For engineers reviewing the X5328P datasheet, X5328P pinout, X5328P application, or X5328P equivalent, this device serves as a system-level power integrity and nonvolatile configuration storage solution-particularly where VTRIP reprogramming, <1µA standby current, and in-circuit programmable ROM mode are required for industrial control, medical instrumentation, or automotive body electronics.

Technical Context

The X5328P implements dual-function supervision: a precision low-VCC detector with five factory-set trip thresholds (reprogrammable via VP-based sequence) and a power-on reset timer releasing RESET after VCC stabilizes for 200ms. Its reset output is open-drain, valid down to VCC = 1V, and remains asserted until VCC exceeds VTRIP for ≥200ms.

Internally, the device integrates a CMOS SPI EEPROM array organized as 4K × 8 bits, featuring Direct Write™ cells (100k write cycles, 100-year retention), 32-byte page write mode, and software-controlled Block Lock™ protection (0%, 25%, 50%, or 100% of memory). Communication uses standard SPI modes 0,0 and 1,1 with MSB-first framing and CS-driven command sequencing.

Key Specifications

Pinout & Package

Package: 8-lead narrow-body SOIC (M8.15E), RoHS-compliant, Pb-free plus anneal finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CPU supervisor with integrated EEPROM applications.

Compared with MAX6361KA29+T and MCP9808-E/P, the X5328P uniquely combines field-reprogrammable VTRIP, 32Kbit EEPROM, and robust reset timing in one SOIC package-making it the only viable option for systems requiring adaptive voltage supervision and high-capacity, protected configuration storage.

Availability

X5328P is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, automotive body electronics, and smart metering applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for X5328P includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics is a global semiconductor leader delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT markets, with expertise in microcontrollers, analog, power, and timing devices.

The X5328P belongs to Renesas' CPU Supervisor family, designed specifically to consolidate power monitoring, reset generation, and nonvolatile memory into a single chip for space-constrained, reliability-critical embedded systems.

FAQ

What is the primary function of the X5328P in a microcontroller-based system?

The X5328P serves as an integrated CPU supervisor and nonvolatile memory device. It ensures reliable system startup by generating a power-on reset signal and protecting against brownout conditions via adjustable VTRIP detection, while simultaneously providing 32Kbit of SPI EEPROM for storing configuration data, calibration values, or firmware metadata. This dual functionality replaces discrete reset ICs and serial EEPROMs in designs such as industrial controllers and medical instruments.

Does the X5328P support reprogramming of its voltage trip point, and how is it performed?

Yes, the X5328P supports VTRIP reprogramming using a dedicated VP pulse sequence applied to SCK and SI pins while CS and WP are held HIGH. The procedure allows precise adjustment of the reset threshold voltage-either upward from its native value or downward after a reset step. This capability eliminates the need for external resistor dividers and enables fine-tuning for specific power rail tolerances in applications like automotive BCMs or battery-powered sensors.

How does the Block Lock™ protection work in the X5328P's EEPROM array?

Block Lock™ protection in the X5328P is controlled by nonvolatile BL0 and BL1 bits in the Status Register. These bits define four protection levels: none, 25%, 50%, or 100% of the 32Kbit EEPROM array. Once set, protected blocks remain read-only until BL bits are rewritten-preventing accidental overwrites of critical data such as calibration constants or security keys. This feature is essential for applications requiring data integrity assurance, including smart energy meters and diagnostic equipment.

What are the key timing specifications for the X5328P's reset output during power-up and brownout events?

The X5328P asserts RESET/RESET at approximately 1V on power-up and holds it active for a minimum of 200ms after VCC stabilizes above the selected VTRIP threshold. During brownout, RESET remains active until VCC falls below VTRIP and stays asserted until VCC rises above VTRIP for 200ms. This guaranteed 200ms timeout ensures microcontrollers complete oscillator stabilization and internal initialization before executing code-critical for deterministic boot behavior in industrial and automotive systems.

Is the X5328P compatible with standard SPI interfaces, and what modes does it support?

Yes, the X5328P is fully compatible with standard SPI master interfaces and supports SPI modes 0,0 (CPOL=0, CPHA=0) and 1,1 (CPOL=1, CPHA=1) at up to 2MHz clock frequency. All commands, addresses, and data are transmitted MSB-first, with SI sampled on the rising edge of SCK and SO driven on the falling edge. The device requires a HIGH-to-LOW CS transition before each operation and maintains high-impedance SO when CS is HIGH-ensuring seamless integration with common microcontroller SPI peripherals.